ICD-10-CM Code Z23

Encounter for immunization

Version 2020 Replaced Code Billable Code Unacceptable Principal Diagnosis POA Exempt

Valid for Submission

Z23 is a billable code used to specify a medical diagnosis of encounter for immunization. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code Z23 might also be used to specify conditions or terms like 1st hib and dtp vaccine given, 2nd hib and dtp vaccine given, 3rd hib and dtp vaccine given, administration of human papilloma virus type 6, 11, 16, and 18 vaccine done, bacillus calmette-guerin vaccination given, diphtheria + tetanus + acellular pertussis +inactivated polio vaccinations given, etc The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

The code Z23 describes a circumstance which influences the patient's health status but not a current illness or injury. The code is unacceptable as a principal diagnosis.

ICD-10:Z23
Short Description:Encounter for immunization
Long Description:Encounter for immunization

Replaced Code

This code was replaced in the 2020 ICD-10 code set with the code(s) listed below. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2019. This code was replaced for the FY 2020 (October 1, 2019 - September 30, 2020).

  • Z29.11 - Enctr for prphylc immther for resp syncytial virus (RSV)
  • Z29.12 - Encounter for prophylactic antivenin
  • Z29.13 - Encounter for prophylactic Rho(D) immune globulin
  • Z29.14 - Encounter for prophylactic rabies immune globin

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code Z23:

Code First

Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
  • any routine childhood examination

  • procedure codes are required to identify the types of immunizations given

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code Z23 are found in the index:


Code Edits

The Medicare Code Editor (MCE) detects and reports errors in the coding of claims data. The following ICD-10 Code Edits are applicable to this code:

  • Unacceptable principal diagnosis - There are selected codes that describe a circumstance which influences an individual’s health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • 1st HiB and DTP vaccine given
  • 2nd HiB and DTP vaccine given
  • 3rd HiB and DTP vaccine given
  • Administration of human papilloma virus type 6, 11, 16, and 18 vaccine done
  • Bacillus Calmette-Guerin vaccination given
  • Diphtheria + tetanus + acellular pertussis +inactivated polio vaccinations given
  • Has influenza vaccination at home
  • Has influenza vaccination at hospital
  • Has influenza vaccination at surgery
  • Has influenza vaccination at work
  • Herpes zoster vaccination given
  • Human papilloma virus type 16 and 18 vaccination given
  • Human papilloma virus vaccination given
  • Human papillomavirus type 9 vaccination given
  • Influenza vaccination given
  • Influenza vaccination requested
  • Influenza vaccination status
  • Influenza vaccination status
  • Influenza vaccination status
  • Influenza vaccination status
  • Measles vaccination given
  • Measles vaccination requested
  • Measles, mumps and rubella vaccination given
  • Medication requested
  • Medication requested
  • Meningococcus B vaccination given
  • Meningococcus vaccination given
  • Mumps vaccination given
  • Pneumococcal 7-valent conjugate vaccination given
  • Pneumococcal immunization status
  • Pneumococcal vaccination given
  • Procedure needed
  • Rubella vaccination given
  • Tetanus toxoid vaccination given
  • Tetanus toxoid vaccination given
  • Tetanus toxoid vaccination given
  • Tetanus toxoid vaccination given
  • Travel vaccination given
  • Vaccination given
  • Vaccination needed
  • Viral hepatitis A and B vaccination given
  • Viral hepatitis A vaccination given
  • Viral hepatitis B vaccination given

Present on Admission (POA)

Z23 is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here .

CMS POA Indicator Options and Definitions
POA Indicator CodePOA Reason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Convert Z23 to ICD-9

  • V05.9 - Vaccin for singl dis NOS (Approximate Flag)

Code Classification

  • Factors influencing health status and contact with health services (Z00–Z99)
    • Persons with potential health hazards related to communicable diseases (Z20-Z29)
      • Encounter for immunization (Z23)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Immunization

Shots may hurt a little, but the diseases they can prevent are a lot worse. Some are even life-threatening. Immunization shots, or vaccinations, are essential. They protect against things like measles, mumps, rubella, hepatitis B, polio, tetanus, diphtheria, and pertussis (whooping cough). Immunizations are important for adults as well as children.

Your immune system helps your body fight germs by producing substances to combat them. Once it does, the immune system "remembers" the germ and can fight it again. Vaccines contain germs that have been killed or weakened. When given to a healthy person, the vaccine triggers the immune system to respond and thus build immunity.

Before vaccines, people became immune only by actually getting a disease and surviving it. Immunizations are an easier and less risky way to become immune.


[Learn More]